Anatomical structure and histochemical tests of tanin in vegetative and reproductive organs (Rhodomyrtus tomentosa)
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Abstract
Abstract. Irwanto, Kuntorini EM, Fariani R. 2023. Anatomical structure and histochemical tests of tanin in vegetative and reproductive organs (Rhodomyrtus tomentosa). Pros Sem Nas Masy Biodiv Indon 9: 126-132. Karamunting (Rhodomyrtus tomentosa) (Aiton) Hassk has been used as traditional medicine; the phytochemical content of karamunting has many benefits. As a taxonomic indicator, an anatomical study determines where compounds are secreted and accumulated in organs. The aim of this study was to observe the anatomical structure and histochemical tests of tannin compounds in the vegetative and reproductive organs of R. tomentosa. The preparation of anatomical structures using paraffin and safranin staining methods and tannin examination compounds by the histochemical method using 5% FeCl3 reagent in methanol. Observation of the anatomical structure of R. tomentosa leaves consisted of the cuticle, upper and lower epidermis, mesophyll tissue, vascular tissue, midrib parenchyma, collenchyma, and trichomes. The stem's transverse anatomical structure comprises the epidermis, trichomes, secretory spaces, collenchyma, parenchyma, pith, and vascular tissue (xylem and phloem). The anatomical plant structure across the root consists of the epidermis, cortex, pith, secretory space, xylem and phloem vascular tissues. In addition, the transverse anatomical structure of the flower crown is composed of the upper and lower epidermis, parenchyma, collenchyma, secretory spaces, xylem and phloem vascular vessels, and trichomes on both crown surfaces. The transverse anatomical structure of green karamunting fruit consists of the pericarp arranged into three layers: the exocarp/outer layer, mesocarp/middle layer, and endocarp/inner layer, as well as the seeds. The tannin histochemical test results on the vegetative and reproductive organs of R. tomentosa showed a positive reaction to the presence of tannin compounds.